White Rogers Universal Two-stage HSI Integrated Igniter and Module Furnace Control Kit 21V51U-843 Features €¢ 120 VAC Ignitor Output €¢ 120 VAC Two-Speed Inducer Output €¢ 120 VAC Humidifier Output €¢ 120 VAC Electronic Air Cleaner Output €¢ 2-Stage Gas Valve Output €¢ 16-Pin Variable Speed Circulator Output €¢ OEM Application €“ Dipswitch Selectable €¢ Fuse Protection €“ 3 Amp €¢ Furnace Status LED €“ Tri-Color (Green, Red and Amber) €¢ CFM LED €“ (Green) €¢ Heat Fan OFF Delay (Dipswitch Selectable) €¢ Fan ON Delay for Cooling €¢ Auto Second Stage Delay (Dipswitch Selectable Mode) €¢ Historical Fault Retrieval by Pushbutton €¢ YLO, Y, W, W2, R, G, C, O, BK/DS/Dehum Terminals €¢ Pressure Switch Inputs and Monitoring €¢ Flash Microprocessor with Non-Volatile Memory €¢ Flame Current Measurement Points 21V51U-843 Cross-Reference: Lennox 18M9901, 49M5901, 50V61-120, - Must replace old igniter with new 21D64-2* Amana / Goodman 20300002, 20300004, B1809925, B1809927, B1809927S - Must replace old igniter with new 21D64-2* USE Wiring Harnesses for Amana/Goodman Amana / Goodman 50V51-288, 50V51-289, 50V51-290, PCB00106, PCB00106S, PCBBF106, PCBBF106S, PCBBF107S USE Wiring Harnesses for Amana/Goodman Coleman / Evcon / Luxaire / York 50V51-243 - Use old igniter or new one American Standard / Trane 50V51-507, CNT03078, D156245P01, D34142P01, X13650840010 - Must replace old igniter with new 21D64-2* Thermo Pride 50V61-143 - Must replace old igniter with new 21D64-2* Note: The installer may have to modify existing ignitor hole to accommodate the new 21D64-2, with ceramic diameter (0.394"). *21D64-2 Ignitor Note:In these applications, the existing 80V ignitor must be replaced by the 120V 21D64-2 ignitor. We are a re-seller. We stock replacement HVAC furnace parts used by the professionals. Give us a call for all your HVAC furnace parts and accessories needs.